Technical Field
[0001] The disclosure relates to a portable loudspeaker configured to output a sound signal,
to a vehicle docking module and to a system comprising the portable loudspeaker and
the vehicle docking module.
Background
[0002] From a physical point of view, loudspeakers with a small membrane and a low depth
are not able to generate a change in volume needed for the playback of low-frequency
sound signals. In other words, one can say, that small loudspeakers are unable to
provide enough bass.
[0003] Furthermore, passive radiators are known in loudspeakers to increase the low-frequency
response or the bass components of the loudspeaker. A passive radiator usually only
includes a membrane, a suspension and a frame. When the passive radiator moves, it
creates sound frequencies as a normal loudspeaker does. However, in a vehicle environment,
passive radiators can be hardly used as movements occurring in the vehicle may cause
an unwanted movement of the passive radiator.
[0004] Furthermore, portable loudspeakers became popular over the last years, especially
in connection with the possibility of storing music signals in small devices wherein
Bluetooth technology is used to couple the portable loudspeaker to a sound signal
source. Due to the size of portable loudspeakers the possibility to output low-frequency
components is limited.
[0005] Accordingly, a need exists to be able to use a portable loudspeaker with an enhanced
bass output.
Summary
[0006] This need is met by the features of the independent claims. Further aspects are described
in the dependent claims.
[0007] According to first aspect a portable loudspeaker configured to output a sound signal
is provided wherein the loudspeaker comprises a housing, a sound generating unit configured
to output the sound signal with a stand-alone frequency characteristic when the loudspeaker
is used in a stand-alone operating mode. The portable loudspeaker furthermore comprises
a port comprising an opening to a space outside of the housing. The port allows a
circulation of air through the opening when the loudspeaker is operating in a connected
operating mode in which the loudspeaker is connected through the port to a first tube
provided in a vehicle, wherein in the connected operating mode the loudspeaker is
configured to output the sound signal with a connected frequency characteristic using
the sound generating unit of the loudspeaker and the first tube provided in the vehicle
to which the loudspeaker is connected through the port. The connected frequency characteristic
comprises an enhanced bass output compared to the stand-alone frequency characteristic.
[0008] The portable loudspeaker can be used in a stand-alone operating mode in the loudspeaker
can act as a normal portable loudspeaker outputting a sound signal having a certain
frequency characteristic, namely a stand-alone frequency characteristic meaning that
it is used without other components to generate the sound signal. The port allows
to connect the portable loudspeaker to the first tube provided in a vehicle, especially
located behind a vehicle panel, so that the Helmholtz resonance can be used in order
to generate sound output using the sound generating unit of the loudspeaker and the
first tube in order to provide a bass enhanced output, meaning an signal characteristic
where the signal pressure level in a frequency range between 30 and 100 Hz especially
between 30 and 60 is higher compared to the stand- alone frequency characteristic.
The theory behind the Helmholtz resonance is known and it is possible to determine
based on the volume of the cavity and the dimension of the port through which the
air enters the cavity, which frequency the generated sound signal has. In order to
provide a frequency enhancement in the range below 60 Hz, by way of example in the
range between 30 and 60 Hz a port is normally necessary in the range of more than
1 meter. This may be possible in a vehicle environment, however, the inventors have
found that a smaller volume of the first tube and of the port is possible without
disturbing higher frequency noise components as the vehicle surrounding components
such as the vehicle compartment or any vehicle panel or seat cushion etc. located
between the user of the loudspeaker and the loudspeaker suppresses the unwanted higher
signal components and only let past the lower frequency components, especially the
frequency components below 60 Hz without major losses.
[0009] Furthermore, a vehicle docking module is provided comprising a connecting port provided
in the vehicle, wherein the connecting port is configured to connect sound waves of
the portable loudspeaker in the connected operating mode of the loudspeaker. The vehicle
docking module furthermore comprises a first tube connected to the connecting port
and provided behind an inner panel provided inside the vehicle, the first tube being
configured to let sound waves emmited by the portable loudspeaker pass inside the
first tube in the connected operating mode. Furthermore a positioning element is provided
and arranged relative to the connecting port such that only a single orientation of
the loudspeaker is allowable when the loudspeaker is connected to the connecting port.
Furthermore, a support structure is provided with support walls configured to keep
the loudspeaker at a fixed position relative to the connecting port. The support walls
are configured such that the loudspeaker is kept in a fixed position relative to the
connecting port in the connected operating mode substantially independent of any vehicle
movements.
[0010] The vehicle docking module allows to correctly connect the portable loudspeaker to
the vehicle and thus to the first tube provided in the vehicle so that the Helmholtz
resonance can be used when the portable loudspeaker is located in the vehicle docking
module.
[0011] Furthermore, a system comprising the loudspeaker and the vehicle docking module is
provided.
[0012] It is to be understood that the features mentioned above and features yet to be explained
below can be used not only in the respective combinations indicated, but also in other
combinations or in isolation without departing from the scope of the present application.
Features of the above-mentioned aspects and embodiments described below may be combined
with each other in other embodiments unless explicitly mentioned otherwise.
[0013] Other features and advantages will become apparent to one with skill in the art upon
examination of the following detailed description and figures. It is intended that
all such additional features and advantages be included within this description, be
within the scope of the invention and be protected by the following claims.
Brief description of the Drawings
[0014] The foregoing additional features and effects of the application will become apparent
from the following detailed description when read in conjunction with the accompanying
drawings in which like reference numerals refer to like elements.
Figure 1 shows a schematic sectional view of a portable loudspeaker comprising a port
with which the loudspeaker can be connected to a vehicle cavity and a closing element
configured to open and close the port.
Figure 2 shows a further schematic view of the loudspeaker of Figure 1 with the closing
element being in an open state.
Figure 3 shows a schematic sectional view of a system in which the portable loudspeakers
of Figures 1 and 2 is connected to a vehicle docking module.
Figure 4 shows a detailed view of a port of the loudspeaker in a closed state.
Figure 5 shows a schematic view in which the port is in the open state when connected
to the vehicle docking module.
Figure 6 shows a schematic perspective view of the system in which the loudspeaker
is connected to the vehicle docking module.
Figure 7 shows a top view and a side view of connecting elements provided in the vehicle
docking module and the loudspeaker.
Figure 8 shows a schematic view of a further possibility of using tubes to connect
the soundwaves from the loudspeaker to the vehicle.
Figure 9 shows a schematic embodiment of the coupling of the loudspeaker to the vehicle
using tubes as shown in Fig. 8.
Figure 10 shows the frequency characteristics of the portable loudspeaker in the stand-alone
and in the connected operating mode.
Detailed description
[0015] In the following, embodiments of the invention will be described in detail with reference
to the accompanying drawings. It is to be understood that the following description
of embodiments is not to be taken in a limiting sense. The scope of the invention
is not intended to be limited by the embodiments described hereinafter or by the drawings,
which are to be illustrative only.
[0016] The drawings are to be regarded as being schematic representations, and elements
illustrated in the drawings are not necessarily shown to scale. Rather the various
elements are represented such that their function and general-purpose becomes apparent
to a person skilled in the art. Any connection or coupling between functional blocks,
devices, components of physical or functional units shown in the drawings and described
hereinafter may be also implemented by an indirect connection or coupling. A coupling
between components may be established over a wired or wireless connection. Functional
blocks may be implemented in hardware, software, firmware, or a combination thereof.
[0017] Figure 1 is a schematic view of a portable loudspeaker 100 which can operate as a
normal loudspeaker in a stand-alone operating mode. The loudspeaker 100 can comprise
a carrying handle 110 a diaphragm 120 and a magnet module 130. Furthermore, bass vents
150 may be provided through which the air of the loudspeaker can circulate. As far
as the components described above are concerned these components are components of
a loudspeaker known in the art and are thus not explained in further detail as the
normal functioning of a loudspeaker is known to a person skilled in the art. The loudspeaker
has a housing 105 which is a sealed box as far as the lower part of the loudspeaker
is concerned.
[0018] The loudspeaker additionally comprises a port 160 and a valve 170 which is configured
to open and close the port. In the embodiment shown in Figure 1, the port is shown
in a closed state in which the valve 170 operating as closing element seals the lower
part of the loudspeaker. The port 160 provides an opening to a space outside of the
housing 105.
[0019] In Figure 2, the port is shown in an open state in which the valve 170 or closing
element is positioned such that air can move from inside the housing 105 to a space
outside the housing as indicated by arrow 170. As will be discussed in connection
with Figures 3 to 5, the valve is opened when the portable loudspeaker 100 shown in
Figure 1 and 2 is connected to a vehicle docking module.
[0020] Figure 3 shows a vehicle docking module 200 to which the loudspeaker 100 is connected.
The docking module comprises a connecting port 210 by which the valve 170 is opened
when the loudspeaker 100 is connected to the docking module 200. The docking module
200 can be provided in a trunk of a vehicle, by way of example, in a side part of
the trunk near and above the wheels. The docking module 200 comprises a first tube
230 through which the air coming from the loudspeaker through the port 160 and the
connecting or tuning port 210 can pass. The first tube 230 has an open end which leads
to a free space 300 in the vehicle. The available cavities (space to position the
port and the first tube) in the vehicle can be in the rear cross member below and
behind the trunk floor, above the wheel arc behind the side panels, or the spare wheel
compartment or below the rear seat. In theory any available space behind the main
surface panels 350 or below seats can be used for the port and the tube. The connecting
port itself is accessible to a user of the loudspeaker so that the loudspeaker can
be connected to the connecting port. The other elements of the docking module are
not necessarily accessible to the user, and are located behind at least one vehicle
panel provided inside the vehicle. The first tube 230 can open into any free space
300 provided between an outside panel responsible for an outer appearance of the vehicle
and an inner panel provided inside the vehicle. The free space as such can be the
full vehicle cabin. The first tube may have any shape and may be rectilinear or may
have a curved shape.
[0021] The port 160 has an opening of a certain dimension and the first tube 230 also has
a certain length.
[0022] By way of example, the port may have a circular or elliptical cross-section. The
first tube 230 must have a length necessary to obtain the right tuning frequency without
audible noise. The length may have to be over 2m, but if designed and positioned correctly
in the vehicle the length may be smaller than 50 cm. When the loudspeaker is connected
to the docking module 200 the loudspeaker can operate in a connected operating mode
using the Helmholtz resonance in which the frequencies generated by the components
such as port, connecting port and tube generate an additional sound signal component
of a certain frequency which depends on the geometry used. The known math of the Helmholtz
resonance effect show that for a bass enhancement system normally a port of the size
of 1.5 m would be necessary which may be possible in a vehicle environment as it can
be hidden behind panels but smaller ports are preferred. As indicated above, the port
is much smaller in the range of several centimeters below 10 cm, so that additional
disturbing noise components will be generated by the system as shown in Figure 3.
However, the enclosing components of the vehicle such as the components in the trunk
and the other components in the vehicle compartment will dampen the higher frequency
components to such an extent that they cannot be heard by a user when the loudspeaker
is used in the connected mode. Only the low frequency components between approximately
60 and approximately 30 Hz are transmitted nearly without attenuation through the
vehicle components such as seat cushions etc..
[0023] The docking module comprises a support structure 240 with side walls 241 and 242
which keep the loudspeaker in a stable position on the docking module. The docking
module furthermore comprises a power supply 250, by way of example a USB connection,
by way of example a USB-C connector so that using cable 260 power can be supplied
to the loudspeaker using USB connector 180 of the loudspeaker. It should be understood
that the connector 250 can also provide the sound signal to be emitted by the loudspeaker.
[0024] Figure 4 shows a more detailed view of the port 160 and the valve 170 in the closed
state so that no air can move through the port 160 to the outside. In this situation,
the loudspeaker 100 can be used in the stand-alone operating mode. In connection with
Figure 5 it is schematically shown how in the connected operating mode the connecting
port 210 opens the valve 170 so that in the connected operating mode air can move
in and out of the port to the first tube 230. In the embodiment shown, a valve may
be used which is pressed on to the port either by magnetic force, by a spring etc..
The element closing or opening the port may be a pure mechanical element, however
it may also be controlled electronically and may be controlled from the outside so
that the port can be closed and opened by a control means not shown in the figures
and not by the connecting part 210.
[0025] Figure 6 shows a perspective view of a system comprising the loudspeaker 100 and
the docking module 200 with the sidewalls 241 and 242 which shows that the side walls
are configured to fix the support the loudspeaker 100 on the docking module 200. Side
walls are arranged such that a movement of the environment, e.g. of the vehicle itself
or of vibrations occurring in the vehicle during a normal driving situation do not
alter the position of the loudspeaker relative to the vehicle docking module 200.
[0026] Figure 7 shows on the left side a bottom view of parts of the loudspeaker of a further
example which make sure that the loudspeaker can only be connected to the docking
module 200 in a single orientation. The left side the port 160 is shown and a guiding
element 190. Furthermore, a USB port 195 may also be provided on the bottom of the
loudspeaker. In this example the USB port is provided on the lower surface whereas
in the other example described above, the USB port was provided in the upper surface
of the loudspeaker 100. The connection can be any; USB or other, and positioned anywhere.
[0027] The right part of Figure 7 it is shown how the loudspeaker is connected to the docking
module 200 with the connecting port 210 and a positioning element 290 which cooperates
with the guiding element 190. Furthermore, the USB connection 250 may be provided
configured to provide power and/or audio signals. The vehicle may have its own audio
system, but may not have a sub-woofer providing the low frequencies as discussed above.
[0028] Figures 8 and 9 show another embodiment in which flared tubes are used to guide the
soundwaves from the loudspeaker to the vehicle docking module. In the embodiment shown
2 open tubes 190 and 300 are used. Each of the tubes has the largest diameter part
at its end, such as and 191, 192 or ends 301 and 302. Due to the larger surface area
the velocity of the soundwaves in the transition area is low and lower compared to
the other sections of the tube. Accordingly the soundwaves are not influenced by the
transition areas between the tube or at the entrance of the tube st end 191 where
the sound waves enter the tubes. The right part of Fig 8 shows a comparative example
with tube 190a and 300a. As shown the velocity is constant in both tubes also in the
transition area and turblances may occur at the connecting part connecting the tubes.
[0029] Figure 9 shows an embodiment using the flared tubes of Figure 8. In the loudspeaker
there is provided tube 190 and the end 192 with the largest diameter plays the role
of the port in the loudspeaker. Accordingly instead of using the port 160 and the
closing element 170 the flared tube 190 is used. The flared tube 190 is used instead
of port 160 and the closing element 170 and the soundwaves leave the loudspeaker at
the end 192. A grile 195 can be provided which avoids unwanted items to enter the
loudspeaker. Furthermore the housing 105 is partly shown showing the location of the
tube 190 inside the loudspeaker. Accordingly the end of the tube 192 is substantially
flush with the outer surface of the loudspeaker.Both ends 191 and 192 could have the
same surface, however it is also possible that one end has a larger diameter surface
compared to the other end.
[0030] At the vehicle side the first tube 300 is also configured as a flared tube. As in
the first embodiment discussed in Fig. 1 to 7, the end 302 opens to the free space
in the vehicle behind the vehicle compartment Furthermore the surface 360 is shown
which is the outer surface or panel similar to panel 350 shown in Figure 3. Additionally
a grille 305 may be provided which keeps unwanted items out of the tube. In the connected
state the end 192 of the tube 190 is located directly on the end 301 of the other
tube 300 so that the surface 105 lies upon surface 360 and no free space is provided
between end 192 and end 301. Accordingly the space 198 is inside loudspeaker 100 and
the space 308 is behind the vehicle panel. In this embodiment there may be no mechanical
connection at the 2 tubes which connect the two tubes. The connection between the
loudspeaker and the vehicle docking module may be obtained by other connecting elements
provided at other parts of the system.
[0031] In this embodiment the loudspeaker, in the stand alone operating mode is not closed,
but due to the shape of the tube, the loudspeaker can nevertheless does work with
an acceptable sound quality even though no closed space is provided in side the loudspeaker.
[0032] Figure 10 shows a comparison of the frequency characteristic of the loudspeaker in
the closed or connected operating mode. Graph 80 shows the frequency characteristic
in the connected operating mode whereas 81 shows the frequency characteristic in the
stand-alone operating mode. As can be seen, in the frequency range below 100 Hz the
system operating in the connected operating mode has more bass output especially in
the range between 30 and 100 Hz. Curve 83 shows an estimated curve with a typical
cabin load in the connected operating mode comprising all the typical elements such
as seats in the vehicle cabin compared to curve 84 describing the curve in the stand-alone
operating mode with a typical cabin load. The difference is up to 6 DB at around 30
Hz which is a considerable difference in sound pressure level.
[0033] The above-described concept provides a portable loudspeaker with an enhanced bass
when connected to a vehicle.
[0034] From the above discussion some general conclusions concerning the loudspeaker and
the vehicle docking module can be drawn. As far as the loudspeaker is concerned, a
closing element may be provided configured to provide th port in a closed state in
which the housing is a sealed housing when the loudspeaker is operating in the stand
alone operating mode , and configured to provide the opening in an open state allowing
the circulation of the air through the opening.
[0035] The closing element may be configured such as to keep the port in a closed state
when the loudspeaker is operating in the stand-alone operating mode. In addition,
the closing element may be configured to keep the port 160 in the open sate when the
loudspeaker 100 is operating in the connected operating mode.
[0036] Furthermore, the loudspeaker may comprise a guiding element such as guiding element
190 shown in Figure 7 to allow a single orientation of the loudspeaker relative to
the vehicle docking module 200 and as a consequence relative to the tube 230 in the
vehicle when operating in the connected operating mode in which the loudspeaker is
connected via the external connecting port 230.
[0037] The loudspeaker may furthermore comprise a USB connector configured to receive charging
power for the loudspeaker from outside the loudspeaker.
[0038] Furthermore, the port may comprise a second tube configured to guide the air to the
opening, wherein the diameter of the tube increases in direction of the opening. This
second tube may be a flared tube with the largerst diameter being provided at the
end of the tube, wherein one end of the second tube is providd at the opening. As
discussed in connection with Figures 8 and 9, the tube in the loudspeaker, also called
second tube, may be used instead of the doing element.
[0039] As far as the vehicle docking module 200 is concerned, tube 230 extends from the
connecting port 210 to another open end of the tube which leads to a free space behind
the inner panel. The tube may have a lengths lying in the interval between 0.5 and
3 m. depending on the amount of bass enhancement needed.
[0040] The support walls 241, 242 of the support structure can extend in a direction in
which the external loudspeaker is connected to the vehicle docking module over at
least 5 cm, preferably over at least 10 cm in order to make sure that a stable orientation
of the loudspeaker in a moving environment is obtained.
[0041] The docking module can further comprise the USB connector configured to provide charging
and operating power to the loudspeaker in the connected operating mode.
[0042] The support walls 241, 242 can extend in the connected operating mode over at least
half of the lengths of the housing of the loudspeaker in order to provide a stable
positioning and orientation of the loudspeaker in the docking module 200.
[0043] In the connected operating mode, the loudspeaker 100 is outputting the sound signal
using the port 160 of the loudspeaker 100 the connecting port 210 and the tube 230
to guide the sound waves.
[0044] The connecting port 210 may be configured such that it opens the closing element
of the loudspeaker when the loudspeaker is connected to the vehicle docking module.
[0045] As discussed above, in the connected frequency characteristic the frequencies below
100 Hz are enhanced compared to the stand-alone frequency characteristic.
[0046] Furthermore, the positioning element 190 and the guiding element 290 can cooperate
to allow only a single orientation of the loudspeaker relative to the vehicle or docking
module 200.
[0047] The tube in the vehicle docking module may be configured such that the first tube
230 extends from the connecting port 210 to another open end of the first tube which
leads to a free space 300 behind the inner panel, wherein the tube 230 has a length
laying in an length interval between 0,5 and 3 m, preferably between 0,5 and 1 m.
[0048] One end of the first tube can play the role of the connecting port, and the diameter
of the first tube increases in direction of the connecting port, wherein at least
one part with the largest diameter of the first tube is provided at the end of the
first tube.
[0049] The end of the tubes facing the other tube can each comprise a grille in order to
avoid unwanted objects entering the tubes.
[0050] The above-described concepts provides a portable loudspeaker having an enhanced bass
while connected to the car.
1. A portable loudspeaker (100) configured to output a sound signal, the loudspeaker
comprising:
- a housing (105),
- a sound generating unit (120, 130) configured to output the sound signal with a
stand-alone frequency characteristic when the loudspeaker is used in a stand-alone
operating mode,
- a port (160) comprising an opening to a space outside the housing,
allowing a circulation of air through the opening when the loudspeaker (100) is operating
in a connected operating mode in which the loudspeaker (100) is connected through
the port (160) to a first tube provided in a vehicle, wherein in the connected operating
mode, the loudspeaker is configured to output the sound signal with a connected frequency
characteristic using the sound generating unit (120, 130) and the first tube provided
in the vehicle, wherein the connected frequency characteristic comprises an enhanced
bass output compared to the stand alone frequency characteristic.
2. The loudspeaker (100) according to claim 1, further comprising a guiding element (190)
configured to allow only a single orientation of the loudspeaker (100) in the vehicle
in the connected operating mode in which the loudspeaker (100) is connected via an
external connecting port provided in the vehicle to the first tube.
3. The loudspeaker (100) according to any of the preceding claims, further comprising
a USB connector (195) configured to receive charging power for the loudspeaker from
outside the loudspeaker.
4. The portable loudspeaker according to any of the preceding claims, further comprising
a closing element configured to provide the port in a closed state in which the housing
is a sealed housing when the loudspeaker is operating in the stand alone operating
mode , and configured to provide the opening in an open state allowing the circulation
of the air through the opening.
5. The portable loudspeaker according to claim 4, wherein the closing element (170) is
configured to keep the port (160) in the closed state when the loudspeaker is operating
in the stand alone operating mode.
6. The portable loudspeaker according to any of claims 1 to 3, wherein the port comprises
a second tube configured to guide the air to the opening, wherein the diameter of
the second tube increases in direction of the opening.
7. The portable loudspeaker according to claim 6, wherein the second tube is a flared
tube with the largerst diameter being provided at the end of the tube, wherein one
end of the second tube is providd at the opening.
8. A vehicle docking module (200) comprising:
- a connecting port (210) provided in the vehicle, the connecting port (210) being
configured to connect sound waves of a portable loudspeaker (100) in a connected operating
mode of the loudspeaker (100),
- a first tube (230) connected to the connecting port (210) and provided behind an
inner panel provided inside the vehicle, the first tube being configured to let sound
waves emitted by the portable loudspeaker pass inside the first tube in the connected
operating mode,
- a positioning element (290) arranged relative the connecting port (210) such that
only a single orientation of the loudspeaker is allowed when the loudspeaker (100)
is connected to the connecting port (210),
- a support structure (240) with support walls (241, 242) configured to keep the loudspeaker
(100) at a fixed position relative to the connecting port (210), wherein the support
walls (241, 242) are configured such that the loudspeaker (100) is kept in the fixed
position relative to the connecting port (210) in the connected operating mode independent
of vehicle movements.
9. The vehicle docking module (200) according to claim 8, wherein the support walls (241,
242) extend in a direction in which the external portable loudspeaker (100) is connected
to the vehicle docking module (200) over at least 0,05 m, preferably over at least
0,1 m.
10. The vehicle docking module (200) according to any of claims 8 to 9, further comprising
a USB connector (250) configured to provide charging and operating power to the loudspeaker
(100) in the connected operating mode.
11. The vehicle docking module (200) of any of claims 8 to 10, wherein the first tube
(230) extends from the connecting port (210) to another open end of the first tube
which leads to a free space (300) behind the inner panel, wherein the first tube (230)
has a length laying in an length interval between 0,5 and 3 m, preferably between
0,5 and 1 m.
12. The vehicle docking module according to any of claims 8 to 10, wherein one end of
the first tube plays the role of the connecting port, and the diameter of the first
tube increases in direction of the connecting port, wherein at least one part with
the largest diameter of the first tube is provided at the end of the first tube.
13. The vehicle docking module according to any of claim 12, wherein a grille is provided
at the end of the tube playing the role of the connecting port.
14. A system comprising a loudspeaker (100) as mentioned in any of claims 1 to 7 and a
vehicle docking module (200) according to any of claims 8 to 13.
15. The system according to claim 14, wherein the support walls (241, 242) extend in the
connected operating mode of the portable loudspeaker (100) over at least half of a
length of the housing of the loudspeaker (100).
16. The system according to claim 14 or 15, wherein the first tube (230) of the vehicle
docking module and is connected to the connecting port and is configured to guide
sound waves to the free space (300).
17. The system according to claim 16, wherein in the connected operating mode the loudspeaker
(100) is configured to output the sound signal using the port (160) of the loudspeaker
(100), the connecting port (210) and the tube (230) in the vehicle to guide sound
waves.
18. The system according to claim 16, wherein the second tube of the portable loudspeaker
and the first tube of the vehicle docking module tube are both flared tubes and are
connected at the part of the 2 tubes having the largest diameter.
19. The system according to any of claims 14 to 18, wherein the connecting port (210)
of the vehicle docking module is configured such that it opens the closing element
(170) of the loudspeaker (100) when the loudspeaker (100) is connected to the vehicle
docking module (200).
20. The system according to any of claims 14 to 19, wherein in the connected frequency
characteristic frequencies below 100 Hz are enhanced compared to the stand alone frequency
characteristic.
21. The system according to any of claim 14 to 20, wherein the positioning element (290)
and the guiding element (190) cooperate to allow only a single orientation of the
loudspeaker (100) relative to the vehicle.